John wrote in news:32fc22da-4c2f-4dd4-86ec-
:

lumps of metal are particularly suseptible, smaller ones less so. My
lathe always suffers as it's nearly a ton of cast iron.

Presumably it acts a little like a "precipitation sink" a la "heat sink". I
wonder if it'd be worth putting in a big old cast iron radiator on a
sacrificial basis to collect the worst of any condensation that appears.

--

All the best,

Chris